Her mother—so self-possessed, and commonsensical—to look and speak like this!
14c., originally the power of uniting mentally the impressions conveyed by the five physical senses, thus "ordinary understanding, without which one is foolish or insane" (Latin sensus communis, Greek koine aisthesis); meaning "good sense" is from 1726. Also, as an adjective, commonsense.
(1776) A pamphlet written by Thomas Paine that called for the United States to declare independence from Britain immediately. Written in a brisk and pungent style, Common Sense had a tremendous impact and helped to persuade many Americans that they could successfully wage a war for their independence.